Maternal Cell Contamination Analysis (In-House Samples Only)

Test Details

Turnaround Time

11 - 21 days (If cultured cells are needed, an additional 7-12 days may be required. Additional culture fee may be included.) Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.

Special Instructions

A maternal blood sample is required to rule out the presence of maternal cells in prenatal samples of uncultured amniotic fluid, CVS, or CVS cultures.


False positive or false negative results may occur for reasons that include: genetic variants, technical handling, blood transfusions, bone marrow transplantation, mislabeling of samples, or erroneous representation of family relationships


Analysis of short tandem repeat markers by polymerase chain reaction (PCR) and capillary electrophoresis

Specimen Requirements

Information on collection, storage, and volume


Whole blood or mouthwash (see specimen kit for detailed instructions)


Adults: 10 mL whole blood or mouthwash.


Lavender-top (EDTA) tube or yellow-top (ACD-A) tube or mouthwash kit

Storage Instructions

Maintain specimen at room temperature

Causes for Rejection

Frozen specimen; hemolysis; quantity not sufficient for analysis; improper container; unlabeled or mislabeled specimen


Mouthwash collection: Patient should not eat, drink, smoke or chew gum for at least one hour prior to collection. (See specimen kit for detailed instructions). Mouthwash samples can be sent when ordering up to two tests. When ordering more than two tests, blood samples are required. 10 mL of ScopeĀ® mouthwash that has been swished vigorously for at least 1 minute. Collect in orange-top 50 mL polypropylene tube.